package com.itheima.reggie.service.impl;


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.dto.SetmealDto;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.entity.SetmealDish;
import com.itheima.reggie.mapper.SetmealMapper;
import com.itheima.reggie.service.SetmealDishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealService {
    @Autowired
    private SetmealDishService setmealDishService;
    @Override
    @Transactional
    public void saveWithDish(SetmealDto setmealDto) {
        //保存套餐的基本信息，操作setmeal，执行insert操作
        this.save(setmealDto);

        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        setmealDishes.forEach(dish->dish.setSetmealId(setmealDto.getId()));

        //保存套餐和菜品的关联信息，操作setmeal_dish,执行insert操作
        setmealDishService.saveBatch(setmealDishes);
    }

    @Override
    @Transactional
    public void removeWithDish(List<Long> ids) {
        //查询套餐状态，判断是否可以删除
        LambdaQueryWrapper<Setmeal> lqw = new LambdaQueryWrapper<>();
        lqw.in(Setmeal::getId,ids);
        lqw.eq(Setmeal::getStatus,1);

        int count = this.count(lqw);
        //如果不能删除，抛出一个业务异常
        if(count > 0){
            throw new CustomException("套餐正在售卖中，不能删除");
        }

        //如果可以删除，先删除套餐表中的数据
        this.removeByIds(ids);

        //删除关系表中的数据----setmeal_dish
        LambdaQueryWrapper<SetmealDish> setmealDishLqw = new LambdaQueryWrapper<>();
        setmealDishLqw.in(SetmealDish::getSetmealId,ids);
        setmealDishService.remove(setmealDishLqw);
    }

    @Override
    public SetmealDto getWithDish(Long id) {
        //查询套餐信息
        LambdaQueryWrapper<Setmeal> setmealLqw=new LambdaQueryWrapper<>();
        setmealLqw.eq(Setmeal::getId,id);
        Setmeal setmeal = this.getOne(setmealLqw);

        //将setmeal信息拷贝入setmealDto
        SetmealDto setmealDto=new SetmealDto();
        BeanUtils.copyProperties(setmeal,setmealDto);

        //根据套餐id查询套餐所关联的菜品
        LambdaQueryWrapper<SetmealDish> setmealDishLqw=new LambdaQueryWrapper<>();
        setmealDishLqw.eq(SetmealDish::getSetmealId,id);
        List<SetmealDish> list = setmealDishService.list(setmealDishLqw);

        //将菜品封装进setmealDto对象
        setmealDto.setSetmealDishes(list);
        return setmealDto;
    }

    @Override
    @Transactional
    public void updateWithDish(SetmealDto setmealDto) {
        //先将套餐表中的数据进行修改
        this.updateById(setmealDto);

        //对套餐关联的菜品进行处理
        //先将被关联的菜品删除
        LambdaQueryWrapper<SetmealDish> lqw=new LambdaQueryWrapper<>();
        lqw.eq(SetmealDish::getSetmealId,setmealDto.getId());
        setmealDishService.remove(lqw);
        //将新菜品加入表中
        List<SetmealDish> list=setmealDto.getSetmealDishes();
        list.forEach(setmealDish -> setmealDish.setSetmealId(setmealDto.getId()));
        //将被关联的菜品加入表中
        setmealDishService.saveBatch(list);
    }


}
